Home / 30,973.56-42,756.59-20,915.61

Finding the Fourth Proportional to 30,973.56, 42,756.59 and 20,915.61

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Solution

The fourth proportional to 30,973.56, 42,756.59 and 20,915.61 is: 28,872.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,973.56 : 42,756.59 = 20,915.61 : x
  2. Step 2: Convert to fraction form
    30,973.56/42,756.59 = 20,915.61/x
  3. Step 3: Cross multiply
    30,973.56x = 42,756.59 × 20,915.61
  4. Step 4: Simplify right side
    30,973.56x = 894,280,056.79
  5. Step 5: Solve for x
    x = 894,280,056.79/30,973.56
  6. Step 6: Final answer
    x = 28,872.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.